CBSE Class 10 Science 2020 · Paper 31/4/1 · Question 20(b)
“During the course of evolution, organs or features may be adapted for new functions.” Explain this fact by choosing an appropriate example.
Answer
Feathers first gave insulation in feathered dinosaurs and were later adapted by birds for flight, a new function.
Example: feathers.
(1) Feathers first provided insulation, keeping the body warm in cold weather. Some dinosaurs had feathers, although they could not fly using them.
(2) Birds later adapted the feathers for flight, a new function.
(3) So a feature that evolved for one function became useful later for a quite different function. This also shows that birds are very closely related to reptiles, since dinosaurs were reptiles.
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